Yet another multiple webserver related question...

Hi,
I found out some thread with similar questions, but no one of them followed up...

This is my config:

ROUTER
↓
pfSense NAT/FW → LAN
↓
DMZ

There are several servers into the DMZ, providing different services... until now!
Since I have NOW two webserver I need to correctly redirect external requests, but I cannot understand how to do this because I need a strange config.

NODE1 (192.168.50.2) is a CentOS 5.3 mailserver, with RoundCube as webmail.
NODE2 (192.168.50.7) is a Mac OS X running Apache, PHP and MySQL, with lots of websites.